背側縫線核への投射について

概要

論文の詳細を見る
Horseradish peroxidase (HRP) was injected iontophoretically into the caudal part of the dorsal nucleus of the raphe (DNR) in cats. Labeled neurons with HRP were recognized in the medial and the superior vestibular nuclei. Furthermore, those were also recognized in the magnocelluar division of the alaminal spinal trigeminal nucleus.<BR>Electrical stimulation of these nuclei elicited orthodromic evoked potentials in the caudal part of DNR which were characterized by a negative potential occurring at a peak latency of 1-1.5 msec. Furthermore, electrical stimulation of these nuclei elicited unitary responses in the caudal part of DNR. It failed to occur at stimulus frequencies above 30 H<SUB>z</SUB> and its atency fluctuated at each stimulus.<BR>These findings in the present study strongly suggest that there exist afferent projections from these nuclei to the caudal part of DNR.